return flow zone
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What are the main factors that determine the size of the return zone in a gasification furnace? Is a larger return zone associated with a thin and long flame, or with a short and thick flame? I hope colleagues will engage in active discussions on this topic
Take a look at that book by Mr. Yu Zunhong; it contains information on that topic
I think it depends on the overall gas velocity at the nozzle of the burner
Regarding the flame situation, I would like to offer the following points: 1. The structure of the burners in gasification furnaces varies, which results in flames of different thicknesses and lengths; for example, the flames from Dongfang furnaces are longer than those from other top-mounted burners, and cross-premixing can occur in the nozzles of four-nozzle gasification furnaces. 2. Regarding the gas velocity at the burner of the gasification furnace, whether it is dry powder or water-coal slurry, a higher gas velocity inevitably results in a longer flame, but it is not certain that the flame will become narrower. 3. The flame behavior is closely related to the quality of the coal; for example, coals with high volatiles have better reactivity, and under the same conditions the flame will inevitably become thicker.